Morgan Stanley (MS) says a credit rating downgrade (currently being considered by Moody's...

Morgan Stanley (MS) says a credit rating downgrade (currently being considered by Moody's on a number of large U.S. financials) could trigger a margin call of up to $7.2B on derivatives contracts. "CEO James Gorman has met with the ratings firm more often than usual in the past quarter." Indeed. (10-Q)